This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant mark

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced

This book provides an overview of arid and semi-arid lands conditions, their general characteristics, methods of management, conservation, exploitation and recl

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced